Seems to exist since 10.0.0 but - how do I close this ?

It looks like I can post replies, but not close.

Depends on the user's location, but those kind of signatures are probably not legally valid at all. They are not equivalent to handwritten signatures, because they cannot be analyzed like handwritten signatures can be validated. Might as well copy-and paste picture of signature. For example in the eIDAS sense (whole European Union), those kind of signatures are of the lowest level possible.

Solution depends on the local legislation. The best option would be either digital signature or make the signature requirement disappear completely.